Efisiensi boiler dipengaruhi oleh faktor-faktor seperti temperatur udara dan pengeringan
batu bara di pulvurizer. Udara pembakaran melewati Air Preheater sebelum masuk
ruang bakar untuk meningkatkan suhu sebelum pembakaran. PLTU Banten 3 Lontar
menggunakan Air Preheater tipe Tri-sector, Vertical Shaft, Ljungstrom Regenerativ,
dengan boiler tipe Pulvurized. Melalui Overhaul, kinerja Air Preheater ditingkatkan,
meningkatkan efisiensi perpindahan panas dari flue gas ke udara, berpotensi
meningkatkan efisiensi pembakaran boiler. Hasil Overhaul pada beban 198 MW
menunjukkan peningkatan efisiensi Air Preheater A sebesar 5,43%, Air Preheater B
sebesar 1,81%, dan efisiensi boiler sebesar 0,4%. Pada beban 290 MW, peningkatan
efisiensi tercatat, yaitu 0,97% untuk Air Preheater A, 0,9% untuk Air Preheater B, dan
0,65% untuk efisiensi boiler. Dengan ini, terlihat bahwa peningkatan efektivitas Air
Preheater sejalan dengan peningkatan efisiensi boiler. NTU menunjukkan peningkatan
seiring dengan efektivitas Air Preheater, sementara LMTD menurun, menandakan
peningkatan daya serap perpindahan panas.

Boiler efficiency is affected by factors such as Air temperature and coal drying in the
pulvurizer. Combustion Air passes through an Air Preheater before entering the
combustion chamber to increase the temperature before combustion. PLTU Banten 3
Lontar uses Tri-sector, Vertical Shaft, Ljungstrom Regenerativ type Air Preheater ,
with Pulvurized type boiler. Through Overhaul, the performance of the Air Preheater is
improved, increasing the efficiency of Heat transfer from flue gas to Air, potentially
increasing the combustion efficiency of the boiler. The Overhaul results at 198 MW
load showed an increase in the efficiency of Air Preheater A by 5.43%, Air Preheater B
by 1.81%, and boiler efficiency by 0.4%. At a load of 290 MW, efficiency improvements
were recorded, namely 0.97% for preheater water A, 0.9% for preheater water B, and
0.65% for boiler efficiency. With this, it is seen that the increase in preheater water
effectiveness is in line with the increase in boiler efficiency. NTU showed an increase
along with preheater water effectiveness, while LMTD decreased, signifying an
increase in Heat transfer absorbency.